Yes, it can.
circle, triangle, square and rectangle
First get any shape and divide it by triangles. For example, a hexagon has six sides, you divided by 4 triangles. You know that a triangle measures 180 degrees, so you add all the triangle by 180 degrees and you give the answer.
54
rectangle, circle,square,triangle
An equilateral triangle...
An equilateral triangle.
circle, triangle, square and rectangle
Squares
First get any shape and divide it by triangles. For example, a hexagon has six sides, you divided by 4 triangles. You know that a triangle measures 180 degrees, so you add all the triangle by 180 degrees and you give the answer.
54
How many lines of symmetry does an equilateral triangle have?
They are five plane shapes!
rectangle, circle,square,triangle
Triangle, Rectangle, Circle, Pentagon
No, parallelograms are specific to quadrilaterals (shapes with 4 sides).
8
There can be no such triangle.