Answer:
We must prove that (c+a)(c+d) = (b+c)(b+d)
- Let us use principles from mathematical induction

- a=bx , b=cx, c=dx
- a+c = b + c
- c +d = b + d
- Such that (a+c)(c+d)=(b+c)(b+d)
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84 and 6 i believe not sure tho
complementary adds to 90°
Answer:
HUH? What do you mean about that?
Would it be 270? if you take 90 3 times. due to that there are 3 different durations.