Which bonds are formed by a carbon atom with $sp^{2}$-hybridisation?

Two hybrid orbitals have a bond angle of $120^o$. The percentage of $s-$ character in the hybrid orbital is nearly ............. $\%$

Non-axial $d-$ orbital is used in hybridisation of

Explain the formation of bonds using $sp^2$ hybrid orbitals with an example.

Predict the hybridization of each carbon in the molecule of the organic compound given below. Also,indicate the total number of sigma $(\sigma)$ and pi $(\pi)$ bonds in this molecule.
$HC \equiv C-CO-CH_2-COOH$

The shape of methane molecule is