The square and the midline of a triangle
Answers are for parents and teachers.
1
The perimeter of a square is 44 cm. How long is a side (cm)?
11
2
A midline of a triangle is 11 cm. How long is the parallel side (cm)?
22
3
The midlines of a triangle are 5 cm, 6 cm and 7 cm. What is the perimeter of the triangle (cm)?
36
4
An equilateral triangle has perimeter 60 cm. How long is its midline (cm)?
10
5
Explain briefly why joining the midpoints of the sides of a convex quadrilateral in order gives a parallelogram.
Draw a diagonal: two of the new sides are midlines parallel to it and half as long, so they are equal and parallel (test 1).