Question

find-
(a) - 7/2×144
(b) -3/15×90
(c) -11/5 of 80
(d) -12/21 of 105​

Answer 1

Answer:

In a ∆DEF, if ∠E = 105° and ∠F = 40°, find ∠D.

ANSWER:

Sum of the angles of any triangle is 180°.

In ∆DEF:

∠D+∠E+∠F=180°∠D+105°+40°=180°or ∠D=180°−(105°+40°)or ∠D=35°

Step-by-step explanation:

pls mark me brainlist pls

Answer 2

Answer:

hope helps u

Step-by-step explanation:

Page No 183:

Question 1:

In a ∆ABC, if ∠A = 72° and ∠B = 63°, find ∠C.

ANSWER:

Sum of the angles of a triangle is 180°.

∴∠A+∠B+∠C = 180°72° + 63° +∠C = 180°∠C = 45°  

Hence, ∠C measures 45°.

Page No 183:

Question 2:

In a ∆DEF, if ∠E = 105° and ∠F = 40°, find ∠D.

ANSWER:

Sum of the angles of any triangle is 180°.

In ∆DEF:

∠D+∠E+∠F=180°∠D+105°+40°=180°or ∠D=180°−(105°+40°)or ∠D=35°