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Mathematics
Grade9
Easy
Question
Given is an equilateral triangle ABC with a radius of 8 cm.
Find the measure of the central angle.
30
60
120
150
Hint:
Angle is a figure which is formed when two rays meet at a common point. Angles can be of many types one of them is central angles. Central angle is formed when two radii of a circle meet at the centre the circle. Central angle of a regular polygon can be determined by using the formula . Here, we have to find the central angle of the given regular polygon.
The correct answer is: 120
In the question there is a triangle as shown in the figure. Here, we have to find the central angle of the given triangle. Central angle = = = 120 So, the central angle of the given triangle is 120. Therefore, the correct option is c, i.e., 120.