An isosceles triangle with all angles less than 90° is an acute-angled triangle. An isosceles triangle with angles of 50°, 50° and 80° is an acute-angled triangle.

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse ...

Besides, we will see how to calculate the area of a triangle, area of an equilateral triangle, area of an isosceles triangle and heron’s formula. Also check the solved examples.

For the next few weeks, the planet Mars will form an almost perfect isosceles triangle with the two bright stars marking the heads of the Gemini Twins, Pollux and Castor.