Home › AP EAPCET (Engineering) › Mathematics › Properties of Triangles › A triangle has side a = 10 and opposite angle A …
A triangle has side a = 10 and opposite angle A = 30°. What is its circumradius?
A5 units
B20 units
C15 units
D10 units
Answer & Solution
Correct answer: D. 10 units
By the sine rule a/sin A = 2R, so 2R = 10/0.5 = 20 and R = 10.
Related questions
Which fact is true of every triangle?When all three sides are given, which rule finds the angles directly?Why can a triangle not be fixed when only its three angles are given?Why is the law of cosines safer for finding an angle?Two sides a, b and the angle between them are known. Which rule gives the difference of thThe law of tangents is mathematically equivalent to which other triangle law?Euclid's Proposition II.12 concerns the square on the side opposite which kind of angle?The excentral triangle has its sides on which lines?