The Einthoven triangle is an equilateral triangle with the heart at its centre and the limbs (left arm, right arm and legs) at the apices. This triangle forms the basis for the theory behind how the ECG functions.
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If a triangle is obtuse, the orthocenter of the triangle actually lies outside of the triangle. If the triangle is acute, the orthocenter of the triangle lies on the inside of the triangle
A triangle can be constructed into any of the given formats.
If a triangle has a right angle, it is a right triangle.
An obtuse angled triangle.
You look at the lengths of the sided of the triangle. If the two lengths are same, the triangle is an isosceles triangle. If all the lengths are same, the triangle is an equilateral triangle. If none of the lengths are same, the triangle is a scalene triangle.