What is the area of a rectangle 9 long, 7 wide and a triangle bottom 10?

Are three sides 7,9,10 (7 + 9 + 10) / 2 = 13 s = root (13 * 6 * 4 * 3) = root 936 formula can't remember, it seems to be Helen formula

A piece of triangle paper is folded into a rectangle (as shown in the figure). The length of the rectangle is 4cm and the width is 3cm. The original area of the triangle paper is 5cm______ Square centimeter

4 × 2 × (3 × 2) △ 2 = 8 × 6 △ 2 = 24 (square centimeter) a: the original area of triangular paper is 24 square centimeter, so the answer is: 24

The area of a rectangle is equal to that of a triangle. The length of a rectangle is equal to the bottom of a triangle. The width of a rectangle is 6cm. What is the height of the bottom edge of a rectangle?

It is suggested that the formula of area: s rectangle = AB, s triangle = ah / 2, the height of triangle is not difficult to find

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