|\ |_\ right-angled triangle
Not necessarily. But a regular triangle must be acute angled.
An acute angled triangle
The name rectangle refers to the right-angled corners. A rectangle is a four-sided shape with right-angled corners.
A right angled triangle.
A right angled triangle is an example of a shape with exactly 2 perpendicular sides.
|\ |_\ right-angled triangle
Not necessarily. But a regular triangle must be acute angled.
Yes
A right (angled) triangle.
Use a protractor.
An acute angled triangle
The name rectangle refers to the right-angled corners. A rectangle is a four-sided shape with right-angled corners.
bevel
A right angled triangle.
A right angled pentagon.
Isosceles triangle