19. एक वृत्ताकार मैदान का व्यास 42 मी है। इसके चारों ओर भीतरी भाग में किनारे सेसटी हुई एक सड़क बनी है। यदि सड़क का क्षेत्रफल 770मी[tex] {?}^{2} [/tex] हो तो सड़क की चौड़ाईज्ञात करें। About the author Ayla
Answer: Step-by-step explanation: Diameter of the Circular Garden = d d = 42 m Radius ( r )= OB = d/2 = 42/2 = 21 m width of the around the Garden (w)=3.5m Radius of the larger circle ( R ) = OA = r + w R = 21 + 3.5 = 24.5 m Area of the Road ( A ) = π( R+r )( R-r ) A = ( 22/7 ) ( 24.5 + 21 )( 24.5 – 21 ) A = ( 22/7 ) × 45.5 × 3.5 A = 22 × 45.5 × 0.5 A = 500.5 m² Therefore , Area of the Road = A = 500.5 m² •••• Reply
Answer:
Step-by-step explanation:
Diameter of the Circular Garden = d
d = 42 m
Radius ( r )= OB = d/2 = 42/2 = 21 m
width of the around the Garden (w)=3.5m
Radius of the larger circle ( R )
= OA
= r + w
R = 21 + 3.5 = 24.5 m
Area of the Road ( A ) = π( R+r )( R-r )
A = ( 22/7 ) ( 24.5 + 21 )( 24.5 – 21 )
A = ( 22/7 ) × 45.5 × 3.5
A = 22 × 45.5 × 0.5
A = 500.5 m²
Therefore ,
Area of the Road = A = 500.5 m²
••••
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