please give solutions of these questions
Answers
Answer:
19) a) ₹5000
b) 8ab+a-7
20) b) <3=70° ( vertically opposite angles)
<2= 110° (linear pair)
Step-by-step explanation:
a) l=60m
b= 40m
area = l×b
= 60×40
= 2400m^2
cost of planting for 1 m^2 = ₹2.50
cost of planting for 2400m^2= ₹5000
b) answer for (b) is self explanatory.
Answer:
19.
a) Length of rectangular field = 60 m
Breadth = 40 m
Area of the field = l × b
= 60 × 40
= 2400 m²
Rate = Rs. 2.50 per m²
Cost = Area × cost
= 2400 × 2.50
= Rs 6000
b) 2ab + 5a - 7 + 6ab - 4a + 3
= 8ab + a - 4
20.
a) (draw the figure on your own here
are the steps of construction follow
them, it may help you.)
Steps of construction :
i) Draw a line segment QR of 7 cm.
ii) With the point Q as centre, draw an
angle of 60°.
iii) Again, with Q as centre and radius
of 5 cm (fixed on your compass),
draw an arc, cutting previously
drawn line at point P.
iv) Join P and R.
Now, ∆PQR is the required triangle.
b) angle 1 = 70°
angle 1 =angle 3 = 70°
(vertically opp.angles)
angle 1 + angle 2 = 180°
( linear pair angles)
70° + angle 2 = 180°
angle 2 = 180° - 70° = 110°