angle, corner, square, horn, antlers
角 centers on a sharp projecting point or a meeting of lines: a horn or antler as a pointed growth, and an angle or corner as a geometric meeting point. The square sense is a specific corner shape.
角 is a pictograph of an animal horn, with the modern form retaining the pointed shape and internal lines suggesting ridges or segments.
The top part looks like a horn's tip, and the lower lines suggest the base and ridges. Picture a bull's horn: sharp, pointed, and forming an angle.
For カク, imagine a horned animal making a sharp 'caw' sound like a crow: caw -> カク, and the horn's angle echoes the sound.
corner; edge
horn; antler
angle
with trouble; at great pains
angle
triangle; triangular shape
corner; section; point; part
triangle
street corner
direction; way
square; rectangular
many-sided; versatile; polygonal; diversified
quadrilateral; square
equal (in ability); even; evenly matched; well-matched; on par (with)
right angle
cornea
(doing) various things; (doing) this and that
(street) corner; turn (in the road); bend
top of the head
acute angle
interior angle; internal angle
external angle; exterior angle
the world of sumo
four corners