It follows that the ratios between corresponding sides are the Is obvious that the third angle in each must be equal.Īre similar.
It is sufficient to show that two angles are equal. If we want to show that two triangles are similar Triangles are said to be similar if all the angles of one triangle are equal toĪll the angles of the other. This point is sometimes called the perpendicular projection of The letter G is used here to label the point where the height and theīase intersect. You have previously learned that the area of a triangle is given by the The height is labelled h in the diagram below. The straight line from angle B perpendicular to the base line b is called That alternate angles between parallel lines are equal).Īlso A + B + C = 180° as together they make a straight line. The angles formed with this line are equal to A, B and C ( by the rule Line through the angle B and parallel to the side b. This can easily be seen by drawing a straight The side on which the triangle stands is called the base of the triangle. The sides that form the arms of the angle A are said to be adjacent to A. Small a, the side opposite angle B with a small b and the side opposite angle C It is also common practice to label the side opposite angle A with a Letters and the sides with small letters. It is common practise to label the vertices of a triangle with capital
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