Question

please answer q 28 fast​

Answer 1

Answer:

Step-by-step explanation:

proof:

It is given in the question that bisector of angle B is BE

therefore, angle ABE = angleB/2

However, angleADE= angleABE

angle ADE= angleB/2

Similarly,

AngleACF =  angle ADF = angle C/2

angleD = angleADE + angleADF

angleD= angleB/2 +angleC/2

          =  1/2(angleB +angleC)

           = 1/2(180-angleA)

because we know the formula as:

angle A + angle B +angle C = 180

applying this we get,

90-angle A/2-------------------1) proved

Similarly, it can be proved that

the rest part.

I hope it will help you!!