Answer
Verified
395.1k+ views
Hint: Here the given of the problem is the radius of a circle. As any tangent and the radius of a circle is perpendicular to each other. From the given information we will get a right-angle triangle. Then we will apply the Pythagoras theorem. From the theorem, we can find the length of \[PQ\].
Complete step-by-step answer:
It is given that; a tangent \[PQ\] at a point \[P\] of a circle of radius \[5\]cm meets a line through the centre \[O\] at a point \[Q\]so that \[OQ = 13\]cm.
We have to find the length of \[PQ\].
We know that the tangent of a circle is perpendicular with its radius at the point of tangent.
So, here the radius \[OP\] is perpendicular to the tangent \[PQ\]. So, \[\angle OPQ = {90^ \circ }\].
Therefore, \[\Delta OPQ\] is a right-angle triangle whose \[\angle OPQ = {90^ \circ }\]and \[OQ = 13\]cm
So, we can apply Pythagoras theorem.
We have,
\[O{Q^2} = O{P^2} + P{Q^2}\]
Substitute the values we get,
\[{13^2} = {5^2} + P{Q^2}\]
Simplifying we get,
\[P{Q^2} = 169 - 25\]
Simplifying again we get,
\[PQ = \sqrt {144} = 12\] (we will take the positive value)
Hence, the length of \[PQ\] is \[12\] cm.
Note: Square root of any value gives two roots: one is positive and another is negative.
Here, \[PQ\] gives another value that is \[ - 12\]. But the length of any object cannot be negative. So, we ignore negative values for the length of \[PQ\].
Tangent to a circle is a line that touches the circle at one point, which is known as point of tangent. At the point of tangent, the tangent of a circle is always perpendicular to the radius.
Complete step-by-step answer:
It is given that; a tangent \[PQ\] at a point \[P\] of a circle of radius \[5\]cm meets a line through the centre \[O\] at a point \[Q\]so that \[OQ = 13\]cm.
We have to find the length of \[PQ\].
We know that the tangent of a circle is perpendicular with its radius at the point of tangent.
So, here the radius \[OP\] is perpendicular to the tangent \[PQ\]. So, \[\angle OPQ = {90^ \circ }\].
Therefore, \[\Delta OPQ\] is a right-angle triangle whose \[\angle OPQ = {90^ \circ }\]and \[OQ = 13\]cm
So, we can apply Pythagoras theorem.
We have,
\[O{Q^2} = O{P^2} + P{Q^2}\]
Substitute the values we get,
\[{13^2} = {5^2} + P{Q^2}\]
Simplifying we get,
\[P{Q^2} = 169 - 25\]
Simplifying again we get,
\[PQ = \sqrt {144} = 12\] (we will take the positive value)
Hence, the length of \[PQ\] is \[12\] cm.
Note: Square root of any value gives two roots: one is positive and another is negative.
Here, \[PQ\] gives another value that is \[ - 12\]. But the length of any object cannot be negative. So, we ignore negative values for the length of \[PQ\].
Tangent to a circle is a line that touches the circle at one point, which is known as point of tangent. At the point of tangent, the tangent of a circle is always perpendicular to the radius.
Recently Updated Pages
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
The branch of science which deals with nature and natural class 10 physics CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
Define absolute refractive index of a medium
Find out what do the algal bloom and redtides sign class 10 biology CBSE
Prove that the function fleft x right xn is continuous class 12 maths CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
Select the word that is correctly spelled a Twelveth class 10 english CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
What is the z value for a 90 95 and 99 percent confidence class 11 maths CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What organs are located on the left side of your body class 11 biology CBSE
What is BLO What is the full form of BLO class 8 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE