If sin a=-4/5 find cos a​

sin a=-4/5

we have sina=perpendicularp/hypotenuseh=-4/5

let p=-4k

h=5k

by Pythagoras theorem

h²=p²+b²

(5k)²=(-4k)²+b²

25k²-16k²=b²

(3k)²=b²

b=√(3k)²=3k

now

cos a =b/h=3k/5k=3/5

the answer would be roots! roots are the parts of the plant that are underground, and that's how they'd anchor the plant. the stem is above the sol, which doesn't with anchoring. hope this !