It is called a frustum.
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Typical figures are cones and pyramids.
A cylinder, a doughnut with a slice cut out by radial planes, a sphere with two slices removed (possibly in a wedge shape), a cone with its top and bottom cut off by horizontal planes, a paraboloid with top and bottom cut off by horizontal planes.
For YOUR safety the conifer should be cut down in sections. Individual limbs to get access to the trunk then 'top' the tree, cut off the top section. Afterwards you can work your way down.
It looks like an isosceles triangle with its top cut off by a line parallel to its base.
we can find the height of a rectangular pyramids located at the top of the base