iska ans ye anna chaiye
(a) ∆ace=40°
(b) ∆dce=60°
Answers
Answer:
Step-by-step explanation:Because set A is a common name for isosceles triangle and equilateral triangle and set c and b is a subset of A
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Step-by-step explanation:
Given: Three angles of a quadrilateral are 75°, 90° and 75°.
Let the fourth angle be x.
Using angle sum property of quadrilateral,
75°+90°+75°+x=360°⇒240°+x=360°
⇒x=360°-240°⇒x=120°
So, the measure of the fourth angle is 120°.
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More clear explanation ❤
In ||gm ABCD,
Base AB = 16 cm
and altitude AE = 8 cm
RD Sharma Class 9 Solutions Chapter 14 Quadrilaterals
∴ Area = Base x Altitude
= AB x AE
= 16 x 8 = 128 cm2
Now area of ||gm ABCD = 128 cm2
Altitude CF = 10 cm
∴ Base AD = \frac { Area }{ Altitude } = \frac { 128 }{ 10 } = 12.8cm
Question 2.
In Q. No. 1, if AD = 6 cm, CF = 10 cm, AE = 8 cm, find AB.
Solution:
Area of ||gm ABCD,
RD Sharma Solutions Class 9 Chapter 14 Quadrilaterals
= Base x Altitude
= AD x CF
= 6 x 10 = 60 cm2
Again area of ||gm ABCD = 60 cm2
Altitude AE = 8 cm
∴ Base AB =\frac { Area }{ Altitude } = \frac { 60 }{ 8 } = \frac { 15 }{ 2 } cm = 60