Answer:
largest angle = 80°
Step-by-step explanation:
sum the parts of the ratio 5 : 5 : 8
5 + 5 + 8 = 18 parts
The sum of the 3 angles in a triangle is 180°
divide 180° by the number of parts in the ratio to find the value of one part
180° ÷ 18 = 10° ← value of 1 part of the ratio
The largest part of the ratio is 8 and represents the largest angle , then
8 × 10° = 80°
The largest angle in the triangle is 80°