Question

21. In A ABC, A + B = 18 units, B + C = 25
units an C +A= 17 units. What type of A
is ABC. Give reason.​

Answer 1

Answer:

ABC is right angled triangle at B

Step-by-step explanation:

A+B=18& A+C=17

A+B-(A+C)=18-17

A+B-A-C=1

B-C=1

B=C+1

C+1+C=25

2C+1=25

2C=25-1

2C=24

C=12

B=12+1

B=13

A+13=18

A=5

5^2+12^2=25+144

=169

=13^2

A^2+B^2=C^2

hence triangle ABC is right angled at B