Question

(20) Each of the equal angles of an isosceles triangle 38, What is the
measure of the third angles.
(21) If two angles are (30-a)° and (125+2a)° and they are supple
ment of each other. find the value of 'a'.
(22) Adjacent sides of a rectangle are 16 cm and 8 cm. Find the area
of the rectangle.
Std.9 Mathematics
(2)
(23) What is the area of A ABC ? If the area of Parallelogram ABCD
is 24 cm
(24) The area of a rhombus is 10 cm?. If one of its diagonal is 4 cm,
then find the other diagonal.
Section-B [2x9 = 18]
Answer the following briefly with calculating
(Any Nine) Question No: 25 to 36) (2 marks each)
(25) Express 0.47 in the form
(26) Find the Value of K, if x-1ts a factor of 4x+ 3x-4x + K.
(27) In cartesian plane. What is the intersection point of two axis and
give it's coordinate point.
(28) Find the two solution for 4x + 3y = 12
(29) Find the value of K, ifx = 2 and y = 1 is a solution of eqnation
2x+3y =K​

Answer 1

Answer:

20.) Question is What is the measure of third angle? ∠CAB = ? SO, ANSWER IS 104°

21.) Sum of supplementary angles is 180

∘

∴(30−a)

∘

+(125+2a)

∘

=180

∘

⇒a+155

∘

=180

∘

⇒a=180

∘

−155

∘

=25

∘