Fig. 20.197. Given AB I CD (see Figure 20.20certainty that ΔΟΒΑ-Δ

1.	Fig. 20.197. Given AB I CD (see Figure 20.20certainty that ΔΟΒΑ-Δ0CD?0), can you tel2
Answer» Given : AB \|\| CD In ∆ OBA and ∆ OCD angle AOB=angle DOC(vertically opposite) angle OAB= angle ODC ( Alternate angle) angle OCD = angle OBA ( Alternate angle) Though AAA rule not exist, no we can not say certainly but if a corresponding side are equal we can use a criterion.

Fig. 20.197. Given AB I CD (see Figure 20.20certainty that ΔΟΒΑ-Δ0CD?0), can you tel2

Answer»

Given : AB || CD

In ∆ OBA and ∆ OCD

angle AOB=angle DOC(vertically opposite)

angle OAB= angle ODC ( Alternate angle)

angle OCD = angle OBA ( Alternate angle)

Though AAA rule not exist, no we can not say certainly but if a corresponding side are equal we can use a criterion.