The diagonal of a rectangle is 25 cm. If one of the rectangle's sides is 15 cm, how do I calculate the area?

Use the Pythagorean theorem to find the sides and then find the perimeter.

For the perimeter, add the four sides together and simplify. For the area, multiply the length by the width.

Let x = the width. Then the length is 2x - 7. The perimeter is twice the width plus twice the length: 64 = (2x) + 2(2x - 7) =...

You don't have enough information to solve.

Such a rectangle would have its sides and diagonal in the ratio of 2:1:√5 (per the Pythagorean theorem). The ratio of √5 to the diagonal (20) is equal to the...

Let s be the shorter side. Then (by the Pythagorean Theorem) s² + 48² = 50². So s² + 2304 = 2500. Then s² = 196, and s = 14...

There is no formula available for finding a side of an irregular pentagon.

Multiply the length of the base of the triangle by 0.5, and then multiply the length from the base to the highest point of the triangle. A = 0.5 x...

Use the Pythagorean Theorem (a^2 + b^2 = c^2). A and B are the lengths of the two sides of the rectangle. To get the length of the hypotenuse, you...

The area (60) is half the product of the diagonals. If d is the unknown diagonal, then 60 = 15d / 2. So 15d = 120, and d = 8...