Question
If the perimeter of a semi-circular protractor is 36 cm. Find its diameter.
✓
Answer
Let r cm be the radius of the protractor, then
Perimeter = πr + 2r
According to the question,
⇒ 36 = πr + 2r
⇒ 36 = r $\left(\frac{22}{7}+2\right)$
⇒ r = 7 cm.
∴ The diameter of the protractor is ( 2 x 7) cm = 14 cm.
Perimeter = πr + 2r
According to the question,
⇒ 36 = πr + 2r
⇒ 36 = r $\left(\frac{22}{7}+2\right)$
⇒ r = 7 cm.
∴ The diameter of the protractor is ( 2 x 7) cm = 14 cm.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Draw an equilateral triangle each of whose sides is 4 cm. Draw all its lines of symmetry.
The line through $P (5, 3)$ intersects y-axis at $Q.$
write the equation of the line
→write the equation of the line
Part of a geometrical figure is given in each of the diagrams below. Complete the figures so. that the line AB in each case is a line of symmetry of the completed figure.
Give also the geometrical name for the completed figure. Recognizable free hand Sketches would be awarded full marks.
Give also the geometrical name for the completed figure. Recognizable free hand Sketches would be awarded full marks.
Let $M \times\left[\begin{array}{ll}1 & 1 \\ 0 & 2\end{array}\right]=\left[\begin{array}{ll}1 & 2\end{array}\right]$ where $M$ is a matrix.
(i) State the order of matrix M
(ii) Find the matrix $M$
→(i) State the order of matrix M
(ii) Find the matrix $M$
Prove.
$\sin ^4 A-\cos ^4 A=2 \sin ^2 A-1$
→$\sin ^4 A-\cos ^4 A=2 \sin ^2 A-1$
In the following figure, PQ is the tangent to the circle at A, DB is a diameter and O is the centre of the circle. If ∠ ADB = 30° and ∠ CBD = 60° ; calculate : ∠CDB
Represent the solution of the given inequalities on the real number line
4x - 1 > x + 11
The volume of a sphere is $905 1/7 cm^3$, find its diameter.
→Find the midpoint of the line segment joining the following pair of point :
$( -3, 5)$ and $(9, -9)$
→$( -3, 5)$ and $(9, -9)$
Find the value of $x,$ if $\tan x=\frac{\tan 60^{\circ}-\tan 30^{\circ}}{1+\tan 60^{\circ} \tan 30^{\circ}}$
→