The length of a semicircle of radius r is:
A4 pi times r
Bpi r squared
Cpi times r
D2 pi times r
Answer & Solution
Correct answer: C. pi times r
1. The full circumference is 2 pi r.
2. A semicircle is half of the circle.
3. So its arc length is pi times r.
4. The answer is pi times r.
_Source: NCERT Class 9 Mathematics, Ch 6 'Measuring Space: Perimeter and Area'_
Related questions
An arc's length depends on the angle it subtends at the:Which shapes are always cyclic?Who found a formula for the area of a cyclic quadrilateral?Heron's formula finds a triangle's area from its:Using Heron's formula, the area of the 3, 4, 5 triangle is:For a triangle of sides 3, 4 and 5, the semi-perimeter is:The semi-perimeter of a triangle is:Two congruent triangles fitted together make a: