UNIT 1: TOOLS OF GEOMETRY POINTS,LINES, & PLANES Geometry is a mathematical system built on accepted facts, basic terms, and definitions.
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1 UNIT 1: TOOLS OF GEOMETRY POINTS,LINES, & PLANES Geometry is a mathematical system built on accepted facts, basic terms, and definitions. Point, line, and plane are all undefined terms. They are the basic ideas that are used to build all other definitions in geometry. POINT LINE PLANE A point indicates a and has no. Usually represented by a small dot. A line extends in dimension. Usually represented by a straight line with two arrowheads to indicate that the line extends without end in two directions. A line contains many points. A plane extends in dimensions. It is a flat surface with no thickness. A plane appears to have edges, but in actuality it extends without end in every direction. Named by a capital letter Named by two points and. Named by a single capital letter or by three of its non-collinear points. Word or Word Phrase Definition Picture or Example intersection An intersection is the set of points two or more figures have in common. Point E is the intersection of the lines. ray opposite rays A ray is part of a line that consists of one and all the points of the line on one side of the endpoint. Point Q is the endpoint shared by these two rays. segment A segment is part of a line that consists of two endpoints and all points between them. collinear Points that lie on the same line are collinear. coplanar Points G, H, and Z are coplanar. Ex.1 Using the diagram name the following: a. A plane. b. Two different lines c. Three collinear points d. Three coplanar points e. The intersection of line r and line s f. The intersection of line r and plane V
2 EX 2. Using the diagram name the following: a. Six segments b. The rays in the figure c. Opposite rays that contain the point C d. Another pair of opposite rays Postulate- Postulate 1-1 Through any points there is exactly one line. Postulate 1-2 If two distinct lines intersect they intersect exactly at one. Postulate 1-3 If two distinct planes intersect they intersect in exactly one. Postulate 1-4 Through any noncollinear points there is exactly one plane. EX 3. Use the diagram to name the following: a. Name the intersection of plane DCG and plane EFG. b. Name the intersection of plane EFG and plane ADH. c. Name the intersection of plane ABG and plane CGH. d. Name two planes that intersect in the line CD. e. Name two planes that intersect in the line DH. f. Name two planes that intersect in the line FG. Ex. 4 Use the diagram at the right. How many planes contain each line and point.? a. KL and G b. HM and F c. NM and M
3 OYO. Assembly Required The bookshelf shown at the right comes in separate pieces, with assembly instructions. The pieces are listed below. T is the top piece, B is the base, and S1 and S2 are shelves. R is the right side, L is the left side, and X is the back piece. Use the diagrams to answer each question. 1. After the bookshelf is assembled, will lines j and o intersect? 2. Will lines k and j intersect? At how many points will the following lines intersect? 3. j and q 4. m and p 5. h and o Name the intersection of each pair of planes. If they do not intersect, write none. 6. B and S1 7. B and L 8. B and R Name two planes that intersect in the given line. 9. k 10. h 11. m 12. Draw a different bookshelf. Then draw each separate component of the bookshelf. How many planes are in your drawing? Which of these planes intersect? Measuring Segments Ruler Postulate Segment addition postulate To find the distance between two points take the absolute value of the difference between the coordinates of 2 points. If H is between G & I, then GH + HI = GI. If GH + HI = GI, then H is between G& I. The length of AB can be found by x2- x1. **The symbol for the length of AB is AB. EX 1. Find the length of each segment. a. PS b. QT c. PT
4 EX 2. GH = 7y + 3, HI = 3y 5, and GI = 9y + 7 a. Find the value of y. b. Find GH, HI, and GI. OYO 1. GH= 3x + 8, HI= 2x + 6, and GI= 10x+9 a. Find the value of x. b. Find GH, HI, and GI. EX. 3 KL = 3x + 2 and LM = 5x 10. a. Find the value of KL. OYO 2. KL = 8x 5 and LM = 6x + 3 a. Find the value of KM. Measuring Angles Angle Formed by two rays that share a common endpoint. The rays are the of the angle. (ZYandZX) The common endpoint is the of the angle. (point A) The angle has sides YZ and XZ and can be named,,, or. How to classify angles Acute Right Obtuse Straight An angle whose measure is greater than ⁰ and less than ⁰ An angle whose measure is exactly ⁰ An angle whose measure is greater than ⁰ and less than ⁰ An angle whose measure is exactly ⁰ Name each shaded angle in three different ways. EX. 1 OYO 1.
5 Protractor Postulate To find the measure of an angle take the of the difference between the two real numbers on the protractor that correspond the sides of the angle. Congruent Angles Congruent angles are angles that have measure. Use the symbol when denoting that two angles are congruent. EX 2. Use the diagram below. Find the measure of each angle. Then classify the angle as acute, right, obtuse, or straight. MEASURE CLASSIFICATION AFD BFD BFE EX 3. Use a protractor. Measure and classify each angle. MEASURE CLASSIFICATION EX 4. Use the diagram below. Complete each statement. 1) MIG 2) PMJ 3) If m KJL = 30, then m = 30. 4) If m LMP = 100, then m QHG = Angle Addition Postulate If point B is in the interior of AXC, then m AXB + m BXC = m AXC.
6 EX 5. If m FHI = 142, what are m FHG and m GHI? OYO 5. JKL is a right angle. What are m JKM and m MKL? EX 6. m CGD = 4x + 2, m DGE = 3x 5, m EGF = 2x Solve for x. OYO 6. m CGD = 2x 2, m EGF = 37, m CGF = 7x + 2. Solve for x. EXPLORING PAIRS PAIR RELATIONSHIPS NAME DEFINITION EXAMPLE NON-EXAMPLE Adjacent angles Vertical angles Linear Pair NAME DEFINITION ADJACENT EXAMPLE NON-ADJACENT EXAMPLE
7 Complementary angles m 1 = 60 and m 2 = 30 m 1 = 60 and m 2 = 30 Supplementary angles m 1 = 120 and m 2 = 60 m 1 = 120 and m 2 = 60 EX 1. Use the diagram at the right. a. Name two pairs of angles that form a linear pair. b. Name two pairs of angles that are complementary. c. Name two pairs of angles that are vertical. d. Name two pairs of angles that are supplementary. OYO 1. Use the diagram at the right. Is each statement true? Explain. a. 5 and 4 are supplementary angles. b. 6 and 5 are adjacent angles. c. 1 and 2 are a linear pair. d. 2 and 5 are a vertical angles OYO 2. In the diagram at the right, m HKI = 48. Find each of the following. a. m HKJ d. m IKJ b. m FKG e. m FKH c. m FKJ f. m GKI Algebra Find the measure of each angle in the angle pair described. EX 2. The measure of one angle is 5 times the measure of its complement. OYO 3. The measure of an angle is 30 less than twice its supplement.
8 Angle bisector A line, segment, or ray that an angle in. Algebra bisects PQS. Solve for x and find m PQS. EX 3. m PQR = 3x, m RQS = 4x 9 OYO 4. m PQR = 5x 4, m SQR = 3x + 10 EX 4. m PQS = 4x 6, m PQR = x + 11 OYO 5. m PQS = 16x +2, m SQR = 6x + 7
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