Question

4. (I) ( 2 x+3 x+5 x=180^{circ}-45^{circ} )
( =135^{circ} )
( Rightarrow 10 x=135^{circ} )
( Rightarrow x=frac{135}{10}=frac{27}{2} )
( therefore ) Largest angle
( =5 x+15^{circ}=left(5 times frac{27}{2}right)^{circ}+15^{circ} )
( =frac{135+30}{2}=frac{165^{circ}}{2} )
( because 180^{circ}=pi mathrm{radian} )
( therefore frac{165^{circ}}{2}=frac{pi}{180} times frac{165}{2}=frac{11 pi}{24} )
radian

# 4. By decreasing 15° of each an- gle of a triangle, the ratios of their angles are 2:3 : 5, The radian measure of greatest angle is : N

Solution