TOÁN LỚP 8 – HÌNH CHỮ NHẬT– ĐỊNH NGHĨA - TÍNH CHẤT VÀ DẤU HIỆU NHẬN BIẾT – SGK MỚI KNTT1

GRADE 8 MATH – RECTANGLE – DEFINITION – PROPERTIES AND RECOGNITION SIGNS – NEW KNTT TEXTBOOK 1) Definition: A rectangle is a quadrilateral with four right angles 2) Properties: A rectangle is an isosceles trapezoid, a parallelogram, so it has all the properties of an isosceles trapezoid and a parallelogram. In a rectangle: The two diagonals are equal and intersect at the midpoint of each line. 3) Signs to recognize a rectangle. +) A quadrilateral with three right angles is a rectangle. +) A parallelogram with one right angle is a rectangle. +) A parallelogram with two equal diagonals is a rectangle. +) An isosceles trapezoid with one right angle is a rectangle. ★ Teacher's Facebook:   / thaycuong84   ★ Fanpage:   / hoctoan24h.net   ★ Teacher Cuong Vlog:    / thaycuongvlog   ★ DON'T FORGET TO LIKE SHARE AND SUBSCRIBE TO SUPPORT THE TEACHER! https://goo.gl/bRVa2w ► REGISTER FOR OFFLINE COURSES: TEACHER CUONG - 09.76.79.85.58 - AN LONG DP GROUP - DAI PHUC COMMUNE - THAI NGUYEN ► COMMENT YOUR OPINIONS BELOW THE VIDEO, THANK YOU! ============================================= #hoctoanthaycuong #luyenthivao10