If the lengths of the two right sides of a right triangle are 7 and 24 respectively, the length of the center line on the hypotenuse is Speed, online, etc... --, at least some process, I don't just want the answer

If the lengths of the two right sides of a right triangle are 7 and 24 respectively, the length of the center line on the hypotenuse is Speed, online, etc... --, at least some process, I don't just want the answer

twelve point five

If the two right sides of a right triangle are 7 and 24 respectively, the length of the middle line on the hypotenuse is______ ．

∵ the two right sides of a right triangle are 7 and 24 respectively ∵ the length of the oblique side of the right triangle is 72 + 242 = 25 ∵ the length of the middle line on the oblique side is 12.5

From 2:15 to 2:30, the angle of the minute hand of the clock is ()
A. 30°B. 45°C. 60°D. 90°

Solution 1: at 2:15, the minute hand is on the number 3, and the minute hand is horizontal. At 2:30, the minute hand is on the number 6, and the minute hand is vertical to the horizontal, so the angle of the minute hand is 90 degrees. Solution 2: because the scale on the clock divides a circle into 12 equal parts, and each part is 30 degrees. From 2:15 to 2:30, the minute hand turns three parts, and the rotation angle is 3 × 30 degrees = 90 degrees So D