∠ABE = <u>∠ABD</u>+∠DBE; <u>∠ABD = 85°</u>.
∠CBE = ∠CBD+∠DBE = 45°; ∠CBD = 40° ⇒ ∠DBE = 45° - 40° = 5°.
∠ABE = 85°+5° = 90°.
Ответ: 90°.