Question

1. Area of a triangle with base (b) and height (h) is: a) b.h b) ½ b.h c)2b.h d) None of these
2. Area of the square with side-length 'a' is: a) 2a b) 4a c) a / 2 d) a ^ 2
3. The area of a rectangle with length (I) and breadth (b) is: a) ½ lb b) 2lb c) lb d) (lb)^ 2
4. Area of a circle with radius 'r' is: a) pi * r ^ 2 b) 1/2 * pi * r ^ 2 c) 2pi * r d) 4pi * r ^ 2
5. 1 cm is equal to how many millimeters? a) 10 b) 100 c) 1/10 d) 1/100
6. The area of a rhombus whose diagonals are of lengths 10 cm and 8.2 cm is: a). 41 cm ^ 2 b) 82 cm ^ 2 c) 410 cm ^ 2 d) 820 cm ^ 2
7. Two dimensional figure is a a)solid b)plane c)cylinder d)none of these a) cuboid b)cone c)sphere d) circle
8. Which of the following is an example of 2 dimension?​

Answer 1

Answer : 1. 1/2 b.h (b)

2. 4a( b)

3. lb(c)

4. 2pi*r (c)

5. 10 (a)

6. 41cm^2

7. Cylinder (c)

8. Circle (d)

Answer 2

Answer:

01. b)$\frac{1}{2}$bh

02. d)a²

03. c)lb

04. a)πr²

05. a)10mm

06. a)41cm²

07. b)plane

08. d)circle

Step-by-step explanation:

The answers to the Questions 01,02,03 and 04 are basic mathematical formulae for the area of various 2-dimensional shapes.

05. 1cm=1×10⁻²m

multiply and divide by 10 on RHS

⇒1cm=1×10×$\frac{10^{-2} }{10}$m

⇒1cm=10×10⁻²⁻¹m

⇒1cm=10×10⁻³m

⇒1cm=10mm           ∵10⁻³=milli

06. Area of Rhombus=$\frac{1}{2}$(p×q) where p and q are the diagonals of the Rhombus.

Given p=10cm and q=8.2cm

∴Area of Rhombus=$\frac{1}{2}$(10×8.2)

⇒Area of Rhombus=$\frac{1}{2}$(82)

⇒Area of Rhombus=41cm²

Two Dimensional figures are those which lie only on any two axes

07. Plane is the only figure which lies in 2 Axis but rest all are 3-D figures

08. Circle is 2-D figure as it occupies only two axis whereas the others are 3-D shapes.