construct a triangle in which DE=EF=5cm and angle E = 30degree .measure angle D & angle F
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angle d = angle f = 75
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if de=ef ,
then it is an isosceles triangle
so, it's opposite angles will also be equal
angleD=angleF
angleD + angleE + angleF=180(all angles of triangle sum is 180)
2angleD +angleE=180
(angleD =angleF)
2angleD +30=180
2angleD=180-30
2angleD=150
angleD=150/2
angleD=75
angleD=angleE=30
then it is an isosceles triangle
so, it's opposite angles will also be equal
angleD=angleF
angleD + angleE + angleF=180(all angles of triangle sum is 180)
2angleD +angleE=180
(angleD =angleF)
2angleD +30=180
2angleD=180-30
2angleD=150
angleD=150/2
angleD=75
angleD=angleE=30
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