Vocabulary consisting only from characters you are able to read

kanji kana meaning randomReload
三角形 sankakkei trianglemath
周り mawari surroundingsjlpt3, jlpt4
次第に shidaini (1)gradually (progress into a state), (2)in sequence, in order, in turn mix
調べる shiraberu to investigateichidan, jlpt4, verb, vtrans
高齢者 koureisha old person or peoplejlpt3