Sign in
Please select an account to continue using cracku.in
↓ →
If the given figure, $$\angle$$ACB + $$\angle$$BAC = 80$$^\circ$$; $$\angle$$BDE = 35$$^\circ$$; $$\angle$$BCE = 45$$^\circ$$, then the marked angle $$\angle$$CED is:
Given,
$$\angle$$ACB + $$\angle$$BAC = 80$$^\circ$$
$$\angle$$BDE = 35$$^\circ$$
$$\angle$$BCE = 45$$^\circ$$
In $$\triangle$$ABC,
$$\angle$$ACB + $$\angle$$BAC + $$\angle$$ABC = 180$$^\circ$$
$$=$$> 80$$^\circ$$ + $$\angle$$ABC = 180$$^\circ$$
$$=$$> $$\angle$$ABC = 100$$^\circ$$
From the figure,
$$\angle$$ABC + $$\angle$$CBD = 180$$^\circ$$
$$=$$> 100$$^\circ$$ + $$\angle$$CBD = 180$$^\circ$$
$$=$$> $$\angle$$CBD = 80$$^\circ$$
In $$\triangle$$FBD,
$$=$$> $$\angle$$FBD + $$\angle$$BDF+ $$\angle$$BFD = 180$$^\circ$$
$$=$$> $$\angle$$CBD + $$\angle$$BDE + $$\angle$$BFD = 180$$^\circ$$
$$=$$> 80$$^\circ$$ + 35$$^\circ$$ + $$\angle$$BFD = 180$$^\circ$$
$$=$$> 115$$^\circ$$ + $$\angle$$BFD = 180$$^\circ$$
$$=$$> $$\angle$$BFD = 65$$^\circ$$
In $$\triangle$$CFE,
$$\angle$$BFD is the exterior angle at point F
$$=$$> $$\angle$$BFD = $$\angle$$FCE + $$\angle$$CEF
$$=$$> $$\angle$$BFD = $$\angle$$BCE + $$\angle$$CEF
$$=$$> 65$$^\circ$$ = 45$$^\circ$$ + $$\angle$$CEF
$$=$$> $$\angle$$CEF = 20$$^\circ$$
From the figure,
$$\angle$$CEF + $$\angle$$CED = 180$$^\circ$$
$$=$$> 20$$^\circ$$ + $$\angle$$CED = 180$$^\circ$$
$$=$$> $$\angle$$CED = 160$$^\circ$$
Hence, the correct answer is Option B
Create a FREE account and get: