Question

Topic: Chapter: 11 Mensuration
Objective: Recapitulation

As you know;
The area of RECTANGLE is:
$l \times b \: = (length \times breadth)$
SQUARE:
$( {side})^{2} = side \: \times \: side$
TRIANGLE:
$\frac{1}{2} \times breadth \times height$
TRAPEZIUM:
$\frac{4}{2}(a + b)$
RHOMBUS:
$\frac{1}{2} \times \: d1 \: \times \: d2$
PARALLELOGRAM:
$b \times h \: = (breadth \times height)$
CIRCLE:
${\pi \: r}^{2}$
GENERAL QUADRILATERAL:
$\frac{d}{2}(h1 + h2)$
have areas. Now, solve these problems for better understanding of the areas of the shapes.

• The area of rhombus is 240cm² and one of the diagonals is 16cm. Find the other diagonal.

• Find the area of rhombus whose diagonals are of lengths 10cm and 8.2cm.

• The floor of a building consists of 3000 tiles which are rhombus shaped and each of its diagonals are 45cm and 30cm in length. Find the total cost of polishing the floor, if the cost per m² is 4/-.

• Find the area of rectangular table whose length is 51 cm and breadth of 43 cm. If the breadth is increased by 12%, what will be the area?
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Answer 1

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