Document page
mathematicsprinted 102 · PDF 103
165 pagesrevision 46935
printed 102 · PDF 103
Page image rendered from the stored file at 110 dpi; it sharpens as you zoom. Outlines are placed from each region’s stored position on the page (595 × 842 pt).
readable
Source of this text: embedded text layer. The better of the embedded text and OCR is kept.
102
Isosceles Triangles
2 sides are of equal length
2 angles are equal
Scalene Triangle
None of the sides are equal
None of the angles are equal
Right-Angled Triangles
One of the angles is equal to 90°
Isosceles Triangles
Area of Triangles
There is one formula which can be used to calculate the area of any triangle.
𝐴𝑟𝑒𝑎 = 1
2 𝑎𝑏⋅𝑠𝑖𝑛(𝜃)
𝑎 and 𝑏 are the 2 sides of a triangle and θ is the angle between those sides.
The formula can be shortened for right angled triangles. If the lengths of the
sides of the triangle which make the 90 degree angle are known, the formula
can be used as follows: