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प्रश्न
In the given figure, DE and DF are tangents from an external point D to a circle with centre A. If DE = 5 cm and DE ⊥ DF then the radius of the circle is ______.
विकल्प
3 cm
4 cm
5 cm
6 cm
MCQ
रिक्त स्थान भरें
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उत्तर
In the given figure, DE and DF are tangents from an external point D to a circle with centre A. If DE = 5 cm and DE ⊥ DF then the radius of the circle is 5 cm.
Explanation:
Join AE and AF. Then, AFDE is a square.
∴ Radius of circle = AE = DE = 5 cm.
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