Question

Construct a ∆RBI in which ∠IRB=60° , BI=5.7 cm, ∠RBI = 90°

Answer 1

Answer:

so the angle is 30°

Step-by-step explanation:

if we take angle I as 60°

and

we take angle B as 90°

then,

we need to find angle R

which is equals to

180°= R+B+I

180°= R+90°+60°

180°-150° =R

R= 30°

Answer 2

construction of triangle RBI

Step-by-step explanation:

construction :

(1) Draw a base line BI = 5.7 cm

(2) From B draw an angle of 90 degree with ruler or compass

(3) since,

$\angle R + \angle B + \angle I$ = 180° ......(angle sum property)

$\angle R = 60$°

$\angle B = 90$°

60+90+ $\angle I$ = 180°

$\angle I$ = 180- 150 = 30°

(4) then draw an angle of 30 degree from I

and let it meet with the BX

(5) the point where IY meet with BX will be the point R

and triangle RBI is formed

#Learn more:

Construct a ∆ABC such that :

BC = 6 cm ,AC = 5.7 cm and angle ACB = 75°

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