In a right-angled triangle with a hypotenuse of 8 cm, one of the legs is 7 cm.

In a right-angled triangle with a hypotenuse of 8 cm, one of the legs is 7 cm. Find the sine of the angle of the opposite leg.

Since you need to find the sine value. Therefore, you need to know that the sinus is the ratio of the opposite leg to the hypotenuse.
1. AB – leg;
2. ВС – hypotenuse;
Let’s write it down with a formula, substitute the values and calculate:
sin a = AB / BC;
sin a = 7/8;
sin a = 0.875;
Answer: sin a = 0.875.