Boundaries of surfaces are
a. surfaces
b. curves
c. lines
d. points

Solution:

We know that

Boundaries of surfaces are known as curves whereas boundaries of solids are known as surfaces.

Therefore, the boundaries of surfaces are curves.

✦ Try This: The assumptions of Euclid are a. Truths, b. Elements, c. Axiom, d. Postulates

We know that

The assumptions are “obvious universal truths”

These are divided into two types.

Therefore, the assumptions of Euclid are truths.

☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 5

NCERT Exemplar Class 9 Maths Exercise 5.1 Problem 8

Boundaries of surfaces are a. surfaces. b. curves, c. lines, d. points

Summary:

A curve is a shape that can be closed or open. Boundaries of surfaces are curves

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