Question

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Answer 1

<DCA = <DBA = 40° ( as ΔADB≈ΔDAC)

Therefore in ΔABD,

<ADB = 180 – (<BAD + <DBA)

= 180 – (100+40)

= 180 – 140

= 40° (Ans)

Answer 2

Step-by-step explanation:

SSS congruence criterion

because in triangle ADB and DAC

AB= DC(given )

AC = DC (given )

AD = AD (common)

therefore by SSS congruence criterion

∆ ADB =~ ∆ DAC

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