$\text { Refer to this figure to answer the question. Assume } \overleftrightarrow { \mathrm { CF } } \text { and } \overleftrightarrow { \mathrm { GJ } } \text { are parallel. }$

-$\text { What is the measure of } \angle \mathrm{DEF} \text { ? }$

A) $90 ^ { \circ }$
B) $0 ^ { \circ }$
C) $120 ^ { \circ }$
D) $180 ^ { \circ }$

Question

$\text { Refer to this figure to answer the question. Assume } \overleftrightarrow { \mathrm { CF } } \text { and } \overleftrightarrow { \mathrm { GJ } } \text { are parallel. }$

-$\text { What is the measure of } \angle \mathrm{DEF} \text { ? }$

A) $90 ^ { \circ }$ 
B) $0 ^ { \circ }$ 
C) $120 ^ { \circ }$ 
D) $180 ^ { \circ }$

Quizplus · Accepted Answer

The measure of angle DEF is $180^\circ$ because in the context of geometry, when an angle is described without specific details, the most common interpretation for an angle named with three points (like DEF) is a straight angle if it's not specified otherwise. A straight angle measures $180^\circ$.

- What is the measure of ∠DEF ? \text { What is the measure of } \angle \mathrm{DEF} \text { ? } What is the measure of ∠DEF ?

- $\text { What is the measure of } \angle \mathrm{DEF} \text { ? }$