#
Construct a triangle DEF in which DE=EF=5cm and angle E=30degree. Measure angle D and anh

le E

1
by Bapi1

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le E

by Bapi1

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now as everyone knows the sum of three angles is 180 degrees, so....

angleD+angleE+angleF=180

[you can put angleD in place of angleF because both are similar]

so,

angleD+angleD+angleF=180

2*angleD+30=180

2*angleD=180-30

2*angleD=150

angleD=150/2=75

so, here we have got the value of angleD which is 75 degrees. Hope it helped, [and what is anh?]

2.the construct ∠E which is 30 degrees.

3.and finally make an arc on EF↔ with the measurement of 5 cms.

3.then construct DF which will be of 5 cms exactly.

4.m∠D=75 [how? It's already mentioned above]