Trigonometry Problem

[chilly rampart]

Can someone give me the answer/explain what all this is about? I'm confused

[tacit lark]

umm.. i think there was maybe supposed to be an angle for ii

if sin(theta) = sqrt(3) / 2

= opposite / hypotenuse

cos(theta) = adjacent / hypotenuse

can find the adjacent side using pythagorean theorem

and therefore the value of cos(theta)

area of the triangle is base * height, so would just need to find the height (opposite side) to the angle