triangle unknown sides area formula with solutions

Solution of triangles - We have studied that a triangle has six parts or six elements viz three sides and three angles. From geometry, we know that when any three elements are given of which necessarily a side is given, the triangle is completely de..

To solve a right angled triangle, we need to find out the unknown sides and the angles with the help of t-ratios. To find a side, usually we take such t-ratios that involve the unknown sides. We have taken A because, th..

To solve a right angled triangle, we need to find out the unknown sides and the angles with the help of t-ratios. To find a side, usually we take such t-ratios that involve the unknown sides. In the figure, AB = 100 cm, find (i) x and (ii)..

When calculating sides or angles of right angled triangles , it is easiest to use the appropriate trigonometric relation. Finding the value of trigonometric ratios from the tables is learnt easily. Nowadays of course calculators are able to give accurate values for ..

The definition, , can be explained in another way also. We rewrite above definition as Here the first term is hf (a). It is the area of the rectangle marked as 1 in figure below (because h and f (a) are the adjacent sides of this rectangle). Similarly, the second term hf (a+h) i..

Two corresponding sides of two triangles are congruent. The triangle, which has a larger included angle of these sides, will have ___. => larger perimeter or small area and small perimeter or smaller area or smaller perimeter..

The ratio of the corresponding sides of two similar triangles is 5 : 11 . What is the ratio of their areas? => 1:1 or 121 : 25 or 25 : 121 or 5 : 11..

The ratio of the corresponding sides of two similar triangles is 3 : 5. What is the ratio of their areas? => 3 : 25 or 9 : 25 or 3 : 15 or 1 : 5..

Find the area of the triangle with two sides 7 cm, 8 cm whose included angle is 70°. => 26.31 cm 2 or 52.62 cm 2 or 28 cm 2 or 56 cm 2..

In the figure given below, the shaded triangles are congruent and isosceles. Each angle opposite to the sides forming the pentagon measures 72 degrees. The area of each shaded triangle is 'A'. Find the area of unshaded region in the figure. => 27 4 ..