Question
Find the area (in cm2) of the scalene
triangle whose sides are 5 cm, 9 cm and 8 cm.Solution
We know that, For a triangle with length of its sides as ‘a’ units, ‘b’ units and ‘c’ units s = {(a + b + c)/2} S o, s = (5 + 9 + 8)/2 = 22/2 = 11 cm Area of the triangle = {s(s – a)(s – b)(s – c)} Required area = {11 × (11 – 5) × (11 – 9) × (11 – 8)} 1/2 = √396 = 6√11 cm 2
'Symbian' is a_______
A shopkeeper mixes two varieties of tea, one costing ₹300 per kg and the other ₹450 per kg, in the ratio 5:3. He sells the mixture at ₹400 per kg....
The volume and height of a cylinder are 5346 cm3 and 21 cm. Find the radius of the cylinder.
A hexagonal prism has a base edge of 6 cm and a height of 10 cm. Find its volume and lateral surface area.
A trader sells two articles for ₹450 each. He makes a profit of 20% on the first and a loss of 10% on the second. What is his overall profit or loss p...
A shopkeeper sells an article at a profit of 12.5% on the selling price. Find the actual profit percentage.
A certain number of men can complete a work in 50 days. If 10 more men are added, the work can be completed in 40 days. Find the original number of men.
The ratio of zinc and copper in a brass pieces is 2:5. How much zinc will be there in 140 kg of such a piece?
Relevant for Exams:
