State whether it is possible to draw the following triangle. If it is possible, write the type of the triangle and if it is not possible explain briefly the reasons.

$△GHK$ with $GH= 4 cm, HK=3 cm$ and $KG= 4cm$

State whether it is possible to draw the following triangle. If it is possible, write the type of the triangle and if it is not possible explain briefly the reasons.

$△LMN$ with $LM=4 cm, MN=4 cm$ and $NL=4 cm$

State the biggest angle in the following triangle.

$△ABC$ with $AB=10 cm, BC=13 cm$ and $CA=9 cm$

State the biggest angle in the following triangle.

$△PQR$ with $PQ=15 cm, QR=15 cm$ and $RP=21 cm$

In an isosceles right-angled triangle $ABC, AC=BC$ and $\angle ACB=90°.$ Find $\angle ABC$.

Find the unknown length $x$ in the below given triangle.

Find the unknown length $x$ in the below given triangle.

Find the unknown length $x$ in the below given triangle.

Find the unknown length $x$ in the below given triangle.