In a right angled triangle, one of the acute angles is four times the other. What is the measure of the smallest angle of the triangle?
Explanation:
In a right triangle, one angle is 90° and the sum of the other two angles is 90°.
These acute angles are divided in the ratio of 1 : 5.
∴ We get x + 4x = 90°
∴ x = 18°
Hence, we get the two acute angles as 18° and 72°.
∴ The smallest angle of the triangle is 18°.
Hence, option (b).
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