S.chand books class 8 maths solution chapter 18 Quadrilateral exercise 18

 EXERCISE 18

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Q1 | Ex-18 | Class 8 | S.Chand | Composite maths| Quadrilateral | Ch-18 | myhelper

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Question 1

The three angles of a quadrilaterals are 110° , 71° and 70°. Find its fourth angle.

Sol :

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Q2 | Ex-18 | Class 8 | S.Chand | Composite maths| Quadrilateral | Ch-18 | myhelper

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Question 2

In a quadrilateral PQRS, ∠P=120° and ∠Q=∠R=∠S, find ∠Q , ∠R and ∠S

Sol :

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Q3 | Ex-18 | Class 8 | S.Chand | Composite maths| Quadrilateral | Ch-18 | myhelper

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Question 3

In the adjoining figure, P is a point in the interior of ∠AOB and ∠AOB=40°. If PM⊥OA and PN⊥OB, find the measure of ∠MPN.

Sol :

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Q4 | Ex-18 | Class 8 | S.Chand | Composite maths| Quadrilateral | Ch-18 | myhelper

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Question 4

Find the unknown angles

Sol :

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Q5 | Ex-18 | Class 8 | S.Chand | Composite maths| Quadrilateral | Ch-18 | myhelper

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Question 5

Find the measures of the four angles of a quadrilateral , if they are in the ratio 3:5:7:9.

Sol :

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Q6 | Ex-18 | Class 8 | S.Chand | Composite maths| Quadrilateral | Ch-18 | myhelper

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Question 6

ABCD is a quadrilateral. AO and BO are the angle bisectors of angles A and B which meet at O. If ∠C=70° and ∠D=50°, find ∠AOB .

Sol :