## RD Sharma Solutions for Class 7 Maths Chapter 20 - Mensuration I (Area of Circle)

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1. What is Two-Dimensional and Three-Dimensional Mensuration?

Ans: Mensuration 2D deals specifically with perimeter and region issues. The form is two-dimensional, such as triangles, squares, rectangles, circles, parallelograms, etc. Mensuration 3D addresses forms such as squares, cuboids, spheres, etc. Generally, the problems are based on volume and surface area.

2. Why is the Chapter Mensuration Needed?

Ans: Mensuration can be clarified as a measurement act. We all exist in a three-dimensional universe. In primary as well as secondary school mathematics, the principle of measurement plays an important role. In addition, measurement has a strong association with our daily lives. For both 3D and 2D objects, we learn to do so while learning to measure objects.

3. Who is Known as the Father of Mensuration?

Ans: Leonard Digges is called the father of measurement. Through his writings in English on surveying, cartography, and military engineering, Leonard Digges was a well-known English mathematician and surveyor, credited with the invention of the theodolite, and a great popularizer of science.