Triangle ABC has perimeter 22 cm. AB = 8 cm
BC = 5 cm
By calculation, deduce whether triangle ABC is a right-angled triangle.

No, it isn't a right triangle

Step-by-step explanation:

AB+ BC + AC= 22            parts whole postulate

8 + 5 + AC = 22            substitution

AC= 22- 13= 9               Algebra

by judging the sides of triangle, we can tell that AC is the longest side therefore is would be the hypotenuse

AC= c

AB= a

CB = b

a^2 + b^2 = c^2       pythagorean theorem

8^2 + 5^2 = 9^2    substitution

64 + 25 = 81        Algebra

89 = 81

ABC is NOT a right triangle

I hope this helps!!!

55 degrees because 55+55=110 degrees