Question

Exercise 9.2
in terms of 1.
1. If the side of an equilateral triangle is 1, then express the perimeter of the triangle
2. The side of a regular hexagon is l. Express its perimeter in terms
3. The length of an edge of a cube is l. Find the formula for the sum
of lengths of all the edges of the cube.
4. If the radius of a circle is r units, then express the length of a
diameter of the circle in terms of r.
of 1.​

Answer 1

Answer:

Q.1 Ans-3

Q.2Ans-6×I

Q.3Ans-12×I

Q.4Ans-2r

Q.1Ans-Perimeter of triangle=Sum of all three

sides

=(3×1) units

=3 units

Q.2Ans- Since Hexagon has 6 sides.

Therefore Perimeter of hexagon=6×I

Q.3Ans-Since, a cube has 6 faces and 12 edges.

Formula for sum=12×I

Q.4Ans-Diameter of a circle is twice the length of radius.