Which statements about triangles are true? Select all that apply.

Two matching copies of a triangle can be joined to make a parallelogram, so A is true. A triangle’s area is A = ½bh, not 2bh, so B is false; this formula also means its area is half that of a rectangle with the same base and height, making C true. A diagonal divides a rectangle into two equal-area triangles, so a 40-square-unit rectangle gives two triangles of 20 square units each, making D true. A triangle with base and height 4 has area ½ × 4 × 4 = 8 square units, less than a 4-by-4 square’s 16 square units, so E is false.

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