Bond angles and molecular geometry of the 2 center carbon atoms of cis-2-butene?

The structural formula of cis-2-butene is :
https://upload.wikimedia.org/wikipedia/commons/1/1c/Cis-2-butene.PNG

Each of the two bonding atoms of C=C double bond (C₂ and C₃) is sp² hybridized. The bond angle is 120° and the shape is triangular.

Each of the two atoms in -CH₃ group (C₁ and C₄) is sp³ hybridized. The bond angle is 109.5° and the shape is tetrahedral.

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