Given that triangle abc is equilateral and line bd is an altitude of triangle abc, how do i prove that line bd is also a perpendicular bisector is line ac? ?

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30