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ahrayia [7]
3 years ago
5

In a right triangle that has one acute angle of 18 degrees, cos 18 degrees is congruent to ?

Mathematics
1 answer:
vichka [17]3 years ago
3 0

Answer:

cos(18°)=sin(72°)

Step-by-step explanation:

we know that

In a right triangle

cos(A)=sin(B)

If A and B are complementary angles

so

A+B=90°

In this problem

A=18°

B=90-18=72°

therefore

cos(18°)=sin(72°)

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