An acute angle is less than 90°. A right angle is exactly 90°. An obtuse angle is greater than 90° and less than 180°, a straight line. An isosceles triangle with all angles less than 90° is ...

This information tells you that this is an isosceles triangle. Let's look at one more triangle. You can also use facts you know about other angles to classify triangles. This triangle has a right ...

Facing due east this week at around 6:30 p.m. local time, we can see an almost perfect isosceles triangle formed by the bright stars marking the heads of Gemini the Twins, Pollux and Castor and ...

Isosceles triangle. An isosceles triangle is a triangle ... angle in a scalene triangle is if we know the other two angles. Right-angled triangle. A right-angled triangle is a triangle where ...

If you connect Mars with Pollux and Castor, both from the constellation Gemini, you get smaller isosceles triangle, with the Red Planet as the brightest of the three points. This triangle will ...