Q. 19 E4.1( 9 Votes )
If the length of A. 12 cm
B. 15 cm.
C. 20 cm
D. 25 cm
Answer :
Let sides of rectangle be L and B.
We know, Diagonal =
Or Diagonal2 = L2 + B2
⇒ 102 = L2 + B2
⇒ 100 sq. cm = L2 + B2
This can be rewritten as
100 = (L + B)2 – 2LB
Area of rectangle = L × B = 62.5 sqcm
Hence,
100 = (L + B)2 - 2 × 62.5
⇒ (L + B)2 = 100 + 125
Or L + B = = 15cm
Rate this question :
How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Champ Quiz | Area of Triangle53 mins
Quiz | Area and Parallelogram46 mins
Champ Quiz | Quadrilateral50 mins
NCERT | Imp Qs on Area of Parallelogram And Triangles44 mins
Quiz | Area of Parallelogram and Triangles43 mins
Smart Revision | Quadrilaterals43 mins
Surface Area of Cube and Cuboid49 mins
Surface Area and Volume of Cone24 mins
Surface Area and Volume of Spheres40 mins
Quiz | Surface Area and Volumes43 mins




















Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
view all courses
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation


RELATED QUESTIONS :
Area of field in
West Bengal MathematicsThe base of a par
West Bengal MathematicsIf perimeter of a
West Bengal MathematicsThe area of field
West Bengal MathematicsIn a quadrilatera
West Bengal MathematicsIn parallelogram
West Bengal MathematicsThe length of one
West Bengal MathematicsIf the leng
West Bengal MathematicsThe length
West Bengal MathematicsIf the leng
West Bengal Mathematics