The triangle: kinds, perimeter and area
Answers are for parents and teachers.
1
Find the perimeter of a triangle with sides 8, 11 and 13 cm.
32
2
One acute angle of a right triangle is 35°. How many degrees is the other acute angle?
55
3
Find the area in cm² of a triangle with base 16 cm and height 7 cm.
56
4
A triangle has area 60 cm² and base 15 cm. Find its height in cm.
8
5
Can a triangle be made from segments of lengths 2, 5, 9? Why?
No: 2 + 5 = 7 < 9, but two sides must sum to more than the third.