25cm
18cm
13cm
9cm
Correct answer is C
perimeter = 2(l + b) = 32
l + b = 322
l + b = 16
b = 16 - 1.......(1)
Area = l + b = 39
lb = 39 .....(2)
put (1) into (2)
l(16 - 1) = 39
16l - l2 = 39
l2 = 13l - 3l + 39 = 0
l(l - 13) - 3(1 - 13) = 0
(l - 3)(l + 130 = 0
l - 3 = 0 or l - 13 = 0
l = 3cm or l = 13cm; The length in 13cm
If angle θ is 135°, evaluate cosθ ...
Using the histogram, estimate the mode of distribution ...
If the pass mark was 4. What percentage of the pupils failed the test? ...
Simplify 2a2 -4ab - 6a2 - 10ab + 5ab - 5a2...
In the diagram, MNR is a tangent to the circle centre O at N and ∠NOS = 108°. Find &ang...
The bearing of a point P from another point Q is 310o. If |PQ| = 200m, how far west of Q is P?...
How many sides has a regular polygon whose interior angles are 120°each ...
The sum of 6 and one-third of x is one more than twice x, find x ...