M l aggarwal understanding icse mathematics class 8 Solutions for Chapter 15 circle

Exercises in Chapter 15 circle Grade 8

Circle Exercise 15

Questions in Circle Exercise 15

Draw a circle with center O and radius 2.5 cm. Draw two radii OA and OB such that ∠AOB = 60. Measure the length of the chord AB.

State whether the following statements are true (T) or false (F) :

(i) A parallelogram has diagonals as its lines of symmetry.

(ii) A regular triangle has three lines of symmetry, one point of symmetry, and has

rotational symmetry of order 3.

(iii) A regular quadrilateral has four lines of symmetry, one point of symmetry and

has . The rotational symmetry of order 4.

(iv) A parallelogram has no rotational symmetry.

(v) A regular pentagon has one point of symmetry.

(vi) The letter Z has one line of symmetry.

Draw a circle of radius of 3.2 cm. Draw a chord AB of this circle such that AB = 5 cm. Shade the minor segment of the circle

Find the length of the tangent drawn to a circle of radius 3 cm, from a point at a distance 5 cm from the centre.

The number of lines of symmetry which a quadrilateral cannot have

(a) 1

(b) 2

(c) 3

(d) 4

In the adjoining figure, PT is a tangent to the circle with centre C. Given CP = 20 cm and PT = 16 cm, find the radius of the circle.

In each of the following figure, O is the center of the circle. Find the size of each lettered angle

In each of the following figures, O is the center of the circle. Find the values of x

and y.

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Chapters in this book

Rational Numbers

Exponents and Powers

Squares and Square Roots

Cubes and Cube Roots

Playing with Numbers

Operation on sets Venn Diagrams

Percentage

Simple and Compound Interest

Direct and Inverse Variation

Algebraic Expressions and Identities

Factorisation

Linear Equations and Inequalities In one Variable

Understanding Quadrilaterals

Constructions of Quadrilaterals

Circle

Symmetry Reflection and Rotation

Visualising Solid Shapes

Mensuration

Data Handling

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