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Published byRussell Hemmingway Modified over 3 years ago

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Picture This! Index Card Area #1 rectangles and triangles

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get a 3'' x 5'' index card

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mark off each inch

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how many square inches? 12345 678910 1112131415

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The area of this rectangle is 15 square inches 12345 678910 1112131415

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Area of a rectangle base x height 12345 678910 1112131415 5 3 =

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12345 678910 1112131415 cut the rectangle in half diagonally Now for a triangle: a triangle!

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The triangle is half of the rectangle 12345 678910 1112131415 A triangle = A rectangle 2

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Area of a triangle base x height 2 = 12345 67845 112345 5 3

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Whats the area of this rectangle? 5'' x 3'' = 15 square inches

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Whats the area of this triangle? 5'' x 3'' = 7.5 square inches 2

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5'' x 2'' = 10 sq. in. Whats the area of this rectangle?

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5'' x 2'' = 5 sq. in. 2 Whats the area of this triangle?

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The area of each triangle every rectangle has 2 triangles in it is 1/2 of the rectangle

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2'' x 3'' = 3 sq. in. 2 Whats the area of this triangle?

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4'' x 3'' = 12 sq. in. Whats the area?

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(4'' x 3'') = 6 sq. in. 2 1

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Remember A = bh 2

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Area of a rectangle base x height 12345 12345 12345 5 3 =

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Area of a triangle base x height 2 = 12345 12345 12345 5 3

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1. 2 Get a rectangular piece of paper and cut it diagonally as shown below. You will obtain two triangles with each triangle having half the area of the.

1. 2 Get a rectangular piece of paper and cut it diagonally as shown below. You will obtain two triangles with each triangle having half the area of the.

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