as before, use Heron's formula, or, if the sides in order are a,b,c then to find angle A, use the law of cosines (a^2 = b^2+c^2-2bc cosA)
100^2 = 250^2 + 275^2 - 2*250*275 cosA
and then the area is 1/2 bc sinA
4. A children’s play area is triangular. The sides of the play area measure 100m, 250m and 275m respectively. Calculate the area of the play area.
1 answer
1 answer