What is true for△DEF, if ∠F is a right angle? A
sinD=cosD because the ratio is the same for each angle in any right triangle.

B
sinD=cosE because the opposite leg for ∠D is the same as the adjacent leg for ∠E.

C
sinD=cosE because the adjacent leg for ∠D is the same as the opposite leg for ∠E.

D
sinD=cosD because the opposite leg and the adjacent leg are the same length in the triangle.

step-by-step explanation:

compare

isocolese triangle

we know that the line connect a and b is the hyptonuse

so first find the hypotonuse length using the distance formula, call the length c

since it is an isocolese triangle, the lengths of the legs are the same

using pythagorean theorem,

in this case, a=b since isocolese triangle so we get

or

we can find c so we can find the distances

we know that if we draw 2 circles, each has center at a and b, and find where they intersect, we can the 2 possible locations for c

if a has center at (xa,ya) and b has center at (xb,yb), then we can solve where

and

intersect to find where they intersect

i'm not going to put an example because i have to go to class. i hope this explanation is enough

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