Question

if a:b = 4:5 , find a​

Answer 1

Answer:

x = 20 degrees

Step-by-step explanation:

4x + 5x = 180

9x = 180

x = 180/ 9= 20 degrees

4x = 4×20=80 degrees

5x= 5×20=100 degrees

Answer 2

$\huge \underline{ \underline{ \bf \purple{Solution :}}}$

Let's :-

$\longrightarrow \: \sf \angle a = 4x \\ \\ \longrightarrow \: \sf \angle b = 5x$

According to Question

$\longrightarrow \: \sf4x + 5x = 180 \\ \\\longrightarrow \: \sf 9x = 180 \\ \\\longrightarrow \: \sf x = \frac{180}{9} \\ \\\longrightarrow \: \sf x = 20$

Therefore

$\longrightarrow \: \sf \angle a = 80 \degree \\ \\ \longrightarrow \: \sf \angle b = 100 \degree$