The highlighted part of the triangle is an angle. It is on the inside of the triangle and formed by two sides coming together.
Hope this helps! :)
Answer:
The sum of the age of pupils is 81
Step-by-step explanation:
Let sum of age of 18pupils = x
Average ages = 4.5
Average = total/no. of pupil
4.5 = x/18
x = 81
Answer:
105
Step-by-step explanation:
because all the angles added up have to = 180
60+15=75
75-180=105
Answer: One
Step-by-step explanation:
7x(7) + 7(2) = 7(x + 2)
49x + 14 = 7x + 14
49x = 7x
x = 0
