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Picture This! Index Card Area #1 rectangles and triangles
get a 3'' x 5'' index card
mark off each inch
how many square inches? 12345 678910 1112131415
The area of this rectangle is 15 square inches 12345 678910 1112131415
Area of a rectangle base x height 12345 678910 1112131415 5 3 =
12345 678910 1112131415 cut the rectangle in half diagonally Now for a triangle: a triangle!
The triangle is half of the rectangle 12345 678910 1112131415 A triangle = A rectangle 2
Area of a triangle base x height 2 = 12345 67845 112345 5 3
Whats the area of this rectangle? 5'' x 3'' = 15 square inches
Whats the area of this triangle? 5'' x 3'' = 7.5 square inches 2
5'' x 2'' = 10 sq. in. Whats the area of this rectangle?
5'' x 2'' = 5 sq. in. 2 Whats the area of this triangle?
The area of each triangle every rectangle has 2 triangles in it is 1/2 of the rectangle
2'' x 3'' = 3 sq. in. 2 Whats the area of this triangle?
4'' x 3'' = 12 sq. in. Whats the area?
(4'' x 3'') = 6 sq. in. 2 1
Remember A = bh 2
Area of a rectangle base x height 12345 12345 12345 5 3 =
Area of a triangle base x height 2 = 12345 12345 12345 5 3
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