Use 30-60-90 triangles
The hypotenuse is twice the side opposite 30°.
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In a 30-60-90 triangle the hypotenuse is 38 cm. How long is the side opposite the 30° angle?
Answer: 19
In a 30-60-90 triangle the hypotenuse is 32 cm. How long is the side opposite the 30° angle?
Answer: 16
In a 30-60-90 triangle the hypotenuse is 80 cm. How long is the side opposite the 30° angle?
Answer: 40
Tip: The hypotenuse is twice the side opposite 30°.
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