1: ____° - ____° - 90°, and ____° - ____° - 90°
3: In a 45° right triangle, the hypotenuse is √2 times as long as the legs.
4: √2 times √2 is 2.
6: To go from the hypotenuse length to a leg length, divide instead of multiply.
7: In a 30° right triangle, the longer leg is √3 times as long as the shorter leg, and the hypotenuse is 2 times as long as the shorter leg.
8: Divide to calculate x, and then multiply to find y.
13: An altitude cuts an equilateral triangle into two 30°-60°-90° triangles.
15: Divide to find the length of a side, and then square that length to get the area of the square.
16: The area of a parallelogram is base times height.
26: The scale factor is 20/30.