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5-Minute Check on Lesson 11-1 Transparency 11-2 Click the mouse button or press the Space Bar to display the answers. Find the area and the perimeter of each parallelogram. Round to the nearest tenth if necessary TRY: Find the height and base of this parallelogram if the area is 168 square units 11 cm 13 cm 45° 60° 11 in 18 in x + 2 x 6.3 m 17 ft 12 ft

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Lesson 11-2 Day 1 Areas of Triangles

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Area of Triangles Triangle Area A = ½ * b * h h is height (altitude) b is base ( to h) R S T W h

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EXAMPLE 1 R S T W h Find the area of triangle RST 10 45°

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Example 2-1a Find the area of quadrilateral ABCD if AC = 35, BF = 18, and DE = 10. EXAMPLE 2

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Example 2-1b Find the area of quadrilateral HIJK if IK = 16, HL = 5 and JM = 9 EXAMPLE 3

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EXAMPLE 4 Find the area of the triangle whose vertices are (3,6), (7,6) and (3,1).

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EXAMPLE 5 Find the area of the parallelogram whose vertices are (0,0), (4,0), (5,5), and (1,5)

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Summary & Homework Summary: The formula for the area of a triangle can be used to find the areas of many different figures Congruent figures have equal areas Classwork: YOU MUST SHOW WORK!!!!! pg 605 (5,13, 14, 19, 20, 34, 35) pg 599 (21-25 and page 605 #7) Plot points first then find the area of each!!!

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