This triangle is a right triangle.

According to the area method: 0.5*25*h=0.5*7*24.

h=6.72

2. After B, BH is perpendicular to AC.

Angle ABH = 30, AB = 5°.

AH=2.5, BH=(5 3)/2, CH=8-2.5=5.5.

In the BCH of Rt triangle, BC 2 = BH 2+CH 2.

BC^2=75/4+ 12 1/4=49

BC=7

3. In a right triangle formed by height, the hypotenuse is 3cm, one angle is 60, and the height is (3 to 3)/2.